<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			div{
				background-color: yellow !important;/* 关键字不可修改的样式 */
			}
		</style>
	</head>
	<body>
		<div id="">
			
		</div>
	</body>
</html>
